Samsung MX-ST90B - Product Overview; USB Ports; Power Connection

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USB1
Connect a USB device to the USB1 or USB2 ports on the main unit.
If you connect your cell phone to the USB1 port, you can charge it.
 Press the (Source) button to select USB1 or USB2.
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USB2
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Power
Connect the power cord to the Power jack and connect the other end of the power
cord to a wall socket to supply electrical power to the Sound Tower.